Copy letter from Robert William Frederick Harrison, to Sir William Abney, Fellow of the Royal Society Harrison reports that Sanger Shepherd has visited to offer a frame, 18 by 14 inches, of natural colour photographs of spectra, continuous solar spectra and line spectra of gasses. He has not yet given an answer, as he wished to first check with Abney that it does not clash with his intended exhibit at the Soirée, noting that it will only be accepted if it does not conflict with Abney's exhibit. 30 April 1904